Objectives: Therefore the aim of this in vitro study was to measure the stain removal and the abrasion on enamel and dentin induced by a new whitening toothpaste (TW) compared with water (W; negative control) and an established toothpaste (TS).
Methods: Dentin specimens were stained by chlorhexidine tea soaking sequences. In an artificial mouth they were brushed with water (W) or slurries of the above mentioned toothpastes (TS, TW). After 2, 7, 17 and 42 min of linear brushing action lightening was measured by a spectrophotometer (ΔL). Bovine enamel (SLE) and dentin (SLD) was used as substrate for testing abrasion. Loss of substrate was determined by laserprofilometry (in µm) after 2, 7, 17 and 42 min of linear brushing action.
Results: ΔL SLE(in µm) SLD(in µm) W -1.4 ± 2.9 0.002 ± 0.001 0.002 ± 0.001 TS 10.0 ± 4.7 0.165 ± 0.029 10.666 ± 1.973 TW 18.1 ± 4.8 0.355 ± 0.111 20.280 ± 5.083 TW showed significant lightening (p<0.01) compared to W and TS. Enamel abrasion was significantly higher in TW but also neglectible. On dentin TW refield substrate loss of 20.280 which was significantly higher compared to TS and W.
Conclusions: The results indicate that the whitening toothpaste removes dentinal stain significantly. While this toothpaste did not affect enamel significantly there was a slight abrasion on dentin. This study was supported by GABA Int. AG.